#page{
    box-sizing: border-box;
    width: 100vw;
    height: 100vh;
    padding: 10px;
    background-color: #fff;
    overflow: hidden;
}

#page>div{
    border: 1px solid #000;
    margin-bottom: 15px;
}

#page>div:last-child{
    margin-bottom: 0;
}